近年來，由於台灣的工商業與高科技產業蓬勃發展，使得各方面的電力需求持續增長，因此國內電力公司必須興建各種電力設施來因應；雖然電力為國家經濟發展的重要基石，但是輸配電系統的發展速度並不及發電端與負載端，使得既設線路要負擔的送電容量越來越重；然而台灣從民國54年開始實施地下化電纜，來提高供電品質、降低天然災害影響、改善架空線路佔地過大與美化市容景觀，卻因為裝設於地底下，受限於環境、道路狹隘、線路架構及接地架構等因素而產生許多不良影響，像是地下電纜的送電電流與容量受到限制、環路架構導致同環路上的用戶在環路任一處發生故障時承受故障電流的風險大幅提高以及電纜遮蔽層在運轉及故障時皆會產生感應電壓及感應環流並注入接地系統等現象。上述種種因素對於電力品質、施工安全、敏感設備等皆有一定程度的影響，因此為了有效降低施工時程及經費支出並使得電網運作能逐步趨於穩健，在規劃線路路徑或是更改接線方式以前，需先考量施工後對電網可能造成之影響。
有鑑於此，本論文將針對台灣地下電纜的正、副導體電纜遮蔽層之接地系統採對稱或不對稱交錯接地之影響進行研究，擬先蒐集並彙整國內外有關電纜遮蔽層之接地系統、突波暫態之相關國際標準、論文及資料，並著重探討接地系統採對稱及不對稱交錯接地設計下的暫態與穩態特性差異；透過ATPDraw模擬軟體建立線路模型及對多種情境進行評估，如接地模式與電纜長度對輸電容量、暫態突波、接地故障、短路故障等線路運行的影響，最後對模擬結果進行比較與分析，以供後續地下電纜接地設計之參考。

In recent years, due to the vigorous development of industry , commerce and high-tech industries, all aspects of power demand keep growing. Thus, domestic power company must build a variety of power facilities to respond it. Although electric power is an important cornerstone of the country's economic development, the development pace of the transmission and distribution system is not as fast as the generation side and load side. This cause the existing lines to bear heavier and heavier transmission capacity. However, Taiwan began to implement underground cables from 1965 to enhance the quality of power supply, reduce the impact of natural disasters, improve the over-occupation of overhead lines and beautify the cityscape. Nevertheless, due to the underground cables are installed under the ground, and have constraints such as environment, narrow roads, line and grounding structures, result in many adverse influences . For example, the power transmission current and capacity of the underground cables are limited, the loop structure makes users in the same loop vulnerable to the failure of other users, and the cable shielding layer generates induced voltage and induced circulating current and injects into the grounding system. The above factors all influence on power quality, construction safety, sensitive equipment, etc. Therefore, in order to effectively reduce the construction time along with expenditure and make the power grid operation gradually become more stable, it is necessary to first consider the possible impact on the power grid after construction , before planning the cable line path or changing the wiring method.
In view of this, the paper will study the impact of the primary and secondary conductor cable using symmetrical or asymmetrical cross- bonding for the grounding system of underground cables in Taiwan. First, it is planned to collect and aggregate relevant domestic and international standards, papers and materials related to grounding system of cable sheath layer and surge transients. The research will focus on exploring the differences in transient and steady-state characteristics under symmetric and asymmetric cross- bonding grounding designs. By using the ATPDraw simulation software to create cable line models and assess various scenarios, such as the impact of grounding type and cable length on transmission capacity, transient surges, grounding faults, short-circuit faults etc. Finally, comparing and analyzing the simulation results in order to provide a reference for subsequent underground cable grounding designs.

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